Karen E. Harris, of Arlington, was 53, according to the Snohomish County Medical Examiner's Office. Her cause of death is under investigation.
Harris' brother, 50, is being held at the Snohomish County Jail for investigation of second-degree murder.
Their mother's body also was found at the property along 240th Street NE. Her name and other details have not been released. Her death also remains under investigation.
The case is being handled by the Snohomish County sheriff's Major Crimes Unit.
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